Duster 11sec?

I can’t remember about the heads I want to say they have been ported and have 208 intake valves but not positive it’s been so long I will double check timing going to try and get to the track this weekend for the first time since the late 90s Will be disappointed if it only runs mid 12s what about shifting kind of nervous to over rev this thing have the rev limiter set at 6400 and seemed to still be pulling
If you have the correct springs with that cam, and your bottom end is solid (i.e. good rod bolts, light forged pistons, etc.) I would not be afraid to send it to 7k if it were me...but if you are only comfortable with 6400 then that's fine too, it should still make good power.